A smooth block is released at rest on a `45^(@)` incline and then slides a distance `d`. The time taken to slide is n times as much to slide on rough incline than on a smooth incline. The coefficient of friction isA. `mu_(k)=1-(1)/(n^(2)`B. `mu_(k) =sqrt((1-(1)/(n^(2)))`C. `mu_(k) = (1)/(1 -n^(2))`D. `mu_(k)=sqrt((1)/(1-n^(2))`

A smooth block is released at rest on a `45^(@)` incline and then slid

1.	A smooth block is released at rest on a `45^(@)` incline and then slides a distance `d`. The time taken to slide is n times as much to slide on rough incline than on a smooth incline. The coefficient of friction isA. `mu_(k)=1-(1)/(n^(2)`B. `mu_(k) =sqrt((1-(1)/(n^(2)))`C. `mu_(k) = (1)/(1 -n^(2))`D. `mu_(k)=sqrt((1)/(1-n^(2))`
Answer» Correct Answer - A `mu_(k) = tan theta(1-(1)/(n^(2)))`

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